Xor trick?

[Adam D. Ruppe]

On Sunday, 26 January 2014 at 00:04:08 UTC, bearophile wrote:
> Do you know how to perform the xor trick 
> (http://en.wikipedia.org/wiki/XOR_swap_algorithm ) on two 
> pointers in D?

You don't; it is undefined behavior and could lead to crashes. 
Suppose another thread triggers a GC run right after the first 
xor. Then there may be no valid pointers to *x and the GC frees 
it, so then after the swap, *y points to something entirely 
different.

> test.d(2): Error: 'x' is not of integral type, it is a int*

You could cast it to size_t, then the compiler will let you do 
the operation, but casting pointers to and from integers means 
you take matters of correctness into your own hands.